In recent years, cases of receiving the report of non-delivery of letters. Basically that's the error: 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, p...

Good day! Tell me, please, is it possible to upgrade c360 immediately to the new version through the GUI, from 7.6.3-019 to 8.5.6? Is there a recommended order for this upgrade? Or is it strongly recommended to do this from the command line (CLI)? I...

Error reports began to come more recently like: #5.0.0 smtp; 5.1.0 - Unknown address error 550-'Callback setup failed while verifying <address@domain.zone>\n(result of an earlier callout reused).\nThe initial connection, or a HELO or MAIL FROM:<> com...